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第1题

The president acknowledged that he had somehow __________ his ability to communicate to the American people. A、 succ
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第2题

计算∬（x2+y2-y）dxdy，D是由y=x，y=1/2x，y=2所围成的区域．
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第3题

It is legally possible for an elderly person to ___________ someone to act for them, should they become incapable of l
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第4题

Most Chinese parents would prefer to choose some professions that are stable and could bring ________and economic benefi
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